GLUT3 is a direct target of TCF4/β‐catenin GLUT3 is a direct target of TCF4/β‐catenin Real‐time PCR analysis for CTNNB1, MYC, and GLUT3 expression in HB cell lines after siRNA transfection. Data show means ± s.d. (n = 3). P‐values were determined by Mann–Whitney test.The promoter region (P) and the intron 2 (I2) of GLUT3 were cloned into a luciferase reporter and measured as relative light unit (RLU) from HEK 293T cells transfected with the luciferase reporter and β‐catenin expressing vector or an empty vector as negative control.Luciferase activity was measured as in (B) with GLUT3 intron 2 separated into four different fragments.Luciferase activity was measured as in (B) with GLUT3 intron 2F4 divided into three fragments.Luciferase activity was measured as in (B). For I2, F4, and F4c, either wild‐type or a variant with a deletion of the TCF4 binding site (ΔTCF4) was used.Chromatin extract from the indicated cell lines was used for TCF4 (upper panel) or β‐catenin (lower panel) ChIP‐real‐time PCR. A 5‐kb region upstream of the MYC gene (5′ Myc) was used as negative control. Experiments were performed in triplicates per each condition and analyzed separately. See Appendix Fig S3A and B.Data information: For (B–E), data show means ± s.d. (n = 5) and P‐values were determined by Mann–Whitney test. Stefania Crippa et al. EMBO Mol Med. 2017;emmm.201707814 © as stated in the article, figure or figure legend